Llamas and alpacas are both domesticated South American camelids, but they have some key differences. The main differences between llamas and alpacas are their size, purpose, and appearance. Llamas are larger than alpacas, with longer faces and banana-shaped ears. They are often used as pack animals and for guarding livestock. On the other hand, alpacas are smaller and have shorter faces with spear-shaped ears. They are primarily bred for their soft fleece, which is used to make clothing and textiles.